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Business Combinations - Schedule of Expected Future Amortization (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Finite Lived Intangible Assets Net $ 114,944 $ 123,351 $ 155,213
Developed Software [Member]      
Business Acquisition [Line Items]      
Finite Lived Intangible Assets Net 15,967    
Customer Relationships, Brand and Backlog [Member]      
Business Acquisition [Line Items]      
Finite Lived Intangible Assets Net 21,854    
VIZIYA [Member]      
Business Acquisition [Line Items]      
2018 3,029    
2019 3,029    
2020 3,029    
2021 3,029    
2022 1,696    
Thereafter 1,369    
Finite Lived Intangible Assets Net 15,181    
VIZIYA [Member] | Customer Relationships and Brand [Member]      
Business Acquisition [Line Items]      
2018 1,029    
2019 1,029    
2020 1,029    
2021 1,029    
2022 1,029    
Thereafter 1,369    
Finite Lived Intangible Assets Net 6,514    
VIZIYA [Member] | Developed Software [Member]      
Business Acquisition [Line Items]      
2018 2,000    
2019 2,000    
2020 2,000    
2021 2,000    
2022 667    
Finite Lived Intangible Assets Net 8,667    
IRD [Member]      
Business Acquisition [Line Items]      
2018 3,805    
2019 3,805    
2020 3,805    
2021 3,805    
2022 2,932    
Thereafter 3,276    
Finite Lived Intangible Assets Net 21,428    
IRD [Member] | Developed Software [Member]      
Business Acquisition [Line Items]      
2018 1,495    
2019 1,495    
2020 1,495    
2021 1,495    
2022 622    
Finite Lived Intangible Assets Net 6,602    
IRD [Member] | Customer Relationships, Brand and Backlog [Member]      
Business Acquisition [Line Items]      
2018 2,310    
2019 2,310    
2020 2,310    
2021 2,310    
2022 2,310    
Thereafter 3,276    
Finite Lived Intangible Assets Net 14,826    
iCOMS [Member]      
Business Acquisition [Line Items]      
2018 90    
2019 90    
2020 90    
2021 90    
2022 55    
Thereafter 45    
Finite Lived Intangible Assets Net 460    
iCOMS [Member] | Developed Software [Member]      
Business Acquisition [Line Items]      
2018 52    
2019 52    
2020 52    
2021 52    
2022 17    
Finite Lived Intangible Assets Net 225    
iCOMS [Member] | Customer Relationships, Brand and Backlog [Member]      
Business Acquisition [Line Items]      
2018 38    
2019 38    
2020 38    
2021 38    
2022 38    
Thereafter 45    
Finite Lived Intangible Assets Net $ 235